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STANAG 3756
STANAG 3756 fuel receipt and delivery couplings
Makers of fuel-handling couplings, hoses and pipeline fittings for military tanker vehicles, storage sites and airfields, and the buyers who specify them.
STANAG 3756 sets the NATO standardized couplings for receiving and delivering aviation kerosene and diesel fuel. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 4
- Published
- 2002-09-09
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
What it is
STANAG 3756 is the NATO Standardization Agreement on facilities and equipment for receipt and delivery of aviation kerosene and diesel fuels. Edition 4, promulgated in September 2002, is sponsored by NATO's LC, OEC and PHEWG committees.
NATO has not released STANAG 3756 publicly. This page describes it from a public national implementation, the Czech defence standard ČOS 999909 (2nd edition, amendment 2, 2024), which states that it introduces STANAG 3756 edition 4 into Czech use. A national implementation can add national requirements and reservations, so treat what follows as the Czech implementation's content, not as NATO's own text.
What the Czech implementation covers
ČOS 999909 standardizes the couplings fitted to equipment, accessories and vehicles at fuel (POL) bases and beyond them, covering stationary and mobile fuel equipment used to receive and deliver aviation kerosene (NATO codes F-34, F-35) and diesel fuel (NATO code F-54, ČSN EN 590), and preventing fuel leaks when elements are connected or disconnected. It sets out which coupling each type of equipment must carry. A delivery system fits the external part of a coupling and a receiving system the internal part; road tankers and aircraft refuellers both take a standardized dry-break NATO coupling with an external 3-inch thread for bottom loading into their own tank, and road tankers deliver fuel through the same coupling's internal 3-inch thread, while aircraft refuellers deliver through a ČSN ISO 45 pressure nozzle. Rail tank cars take either a ČSN EN ISO 228-1 coupling with an internal 4-inch thread, or, for gravity draining, an API 1004 4-inch Kamlock coupling.
What the standardized coupling itself must do
For the standardized 3-inch (80 mm) NATO coupling set out in chapter 11 of the Czech text, the requirements are mostly performance limits. The coupling must be designed for a minimum operating pressure of 600 kPa, show no leakage or deformation up to 1.75 times that pressure, no leakage up to 2.5 times it, and withstand 5 times it without cracking. Across 10 connect and disconnect cycles at 100 kPa above the system's maximum operating pressure, average fuel leakage must not exceed 4 ml per operation. Electrical resistance across a dry coupling, measured between its flanges or threads, must stay below 10 ohms, and the pressure loss through the adapter when tested with aviation kerosene must stay under 50 kPa. Coupling materials, seals and gaskets must not affect fuel quality, and a manufacturer must document the material composition and test results on request.
How we help
A supplier bound by STANAG 3756 through a contract holds the obtained text through its national authority. In ComplyTrain you record the requirements that apply to you as your own requirements, give each an owner, and keep the evidence that shows you meet them against each one.
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